Entry 2 senses Webster, 1913 Parlous · Par·lous · IPA /ˈpɑɹləs/ 01 a. Attended with peril; dangerous; as, a parlous cough. 1. Attended with peril; dangerous; as, a parlous cough.[Archaic] 2. Venturesome; bold; mischievous; keen.[Obs.]